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Mary Avenue Overcrossing

The Mary Avenue Overcrossing project aims to relieve north-south traffic congestion in Sunnyvale, improve multimodal access between Moffett Park and other areas, and support smart growth in Moffett Park area.

The project would provide a multimodal connection from Mary and Almanor avenues, over US-101, SR-237 and Moffett Park LRT Station to 11th Avenue and Discovery Way (formerly E Street) in Moffett Park.

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Angela Obeso, Principal Transportation Engineer, 408-730-7557


There are four different options for the project's conceptual design, including a fifth option for no project. The project team will present a project option to City Council in March 2021. Council will select a project option for the EIR*. Regardless of the project option selected, all four options will be studied. See Details tab for project options.

*for the purpose of the Environmental Impact Report (EIR), a project alternative must be selected

Upcoming Events

City Council Study Session
Topic is an agenda item at the City Council meeting 
(PDF download)

When: Tuesday, Feb. 2, 5:30 p.m.
Where: Watch on YouTube
Or Participate on Zoom
Or by telephone - Call: 833-548-0276; Meeting ID: 961 1158 0540

Next Steps

March 2021 - City Council Regular Session for the selection of Project Alternative for the EIR

Spring 2021 - Winter 2022 - Preparation of Draft EIR and Final EIR

Winter 2022 - Approval of EIR and selection of Preferred Alternative


Map of location

As part of the EIR, we are analyzing the following project options:

  1. Four lanes of motor vehicle travel with sidewalks and protected bicycle facilities
  2. Two lanes of motor vehicle travel with sidewalks and protected bicycle facilities
  3. Two lanes for transit, shuttle and high-occupancy vehicles with sidewalks and protected bicycle facilities
  4. Pedestrian and bicycle overcrossing
  5. Removal of the overcrossing from the General Plan


Mary Avenue Overcrossing was included in the following City of Sunnyvale plans:

  • 1981 City of Sunnyvale General Plan
  • 1981 Transportation Element
  • 1997 Land Use and Transportation Element
  • 2004 Moffett Park Specific Plan
  • 2005 Traffic Impact Fee
  • 2011 Consolidated General Plan
  • 2013 Moffett Park Specific Plan Update
  • 2016 Peery Park Specific Plan
  • 2017 Land Use and Transportation Element
  • 2017 Traffic Impact Fee
  • 2021 Moffett Park Specific Plan Update (in progress)

In 2007, the City of Sunnyvale completed a Draft Environmental Impact Report (EIR)  for Mary Avenue Extension. Many members of the community provided comments on the Draft ElR. The City responded to community comments. The following were the key concerns:

  • traffic congestion
  • traffic speed
  • pedestrian and bicyclist safety
  • air pollution and emissions
  • noise
  • property values
  • smart growth
  • transit access
  • merchant revenues

The City Council certified the Final ElR and approved the Mary Avenue Extension project in October 2008. In 2009, the Sunnyvale West Neighborhood Association filed a legal challenge against the City. The legal challenge was about the adequacy of the ElR document, and the use of a 2020 traffic baseline for the traffic analysis. The Superior Court granted the petition in 2009. The 6th District Court of Appeal upheld the Superior Court decision in 2010. Because of this, the City Council decertified the EIR and voided the project approval in 2011.

Without an adequate EIR, no action has occurred on the project since that time. In 2015, City Council directed staff to prepare an updated scope. This scope included preparing an EIR with updated alternatives and a robust outreach. In 2016, the City selected a consultant team to begin updating the EIR.

The Office of the City Attorney (OCA) advised the project team of a recent case law. The case law involved a multi-project EIR that did not identify a project alternative up front. The courts ruled that EIR as violating California Environmental Quality Act (CEQA). The violation was due to the EIR not having an "accurate, stable and finite" project description for the public. The OCA advised the project team to select a project alternative for the purposes of the EIR. Regardless of which alternative the City Council selects, the EIR will study all five alternatives. The City Council will select the preferred project alternative after completion and acceptance of the Final EIR.

Last Updated: Feb 1, 2021